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Selina Concise ICSE Solutions for Class 7 Biology Chapter 7 Allergy Match the following answers Review Questions Question 1. Define the term “allergy”. Answer: Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes no adverse effects to most people. These diseases include hay fever, dermatities, asthma, food allergies, etc. Question 2. Name the inflammatory chemical released by the basophils causing skin reaction and construction of the bronchioles. Answer: The histamine causes inflammation, skin rash and constriction of the bronchioles (as in asthma). Question 3. How the allergy causing chemical is naturally removed from the body ? Answer: There are no permanent cure for an allergy. Medication for allergies do give relief. Those people prone to allergic reactions should be aware of the allergens that trigger these responses in their bodies and avoid them comp...

Biology Textbook: Living Science Biology by Ratna Sagar Class 7 Click on the links given alongside the chapters to go to exercise solutions and important question with answers:-  Chapter 1: Plant Tissues:  http://novakidhs.blogspot.com/2022/02/plant-tissue-animal-tissue-class-7.html Chapter 2: Animal Tissues:  http://novakidhs.blogspot.com/2022/02/plant-tissue-animal-tissue-class-7.html Chapter 3: Classification of the Living Things:  http://novakidhs.blogspot.com/2022/02/classification-of-living-things-class-7.html Chapter 4: Classification of Animals:  http://novakidhs.blogspot.com/2022/02/classification-of-animals-class-7.html Chapter 5: Photosynthesis:  http://novakidhs.blogspot.com/2022/02/photosynthesis-and-respiration-class-7.html Chapter 6: Respiration in Plants:  http://novakidhs.blogspot.com/2022/02/photosynthesis-and-respiration-class-7.html Chapter 7: Excretory System in Humans:  http://novakidhs.blogspot.com/2022/02/excretion-in-anima...

Selina Concise ICSE Solutions for Class 7 Biology Chapter 6 Nervous System Synopsis — The interaction of these activities of a living being as per the needs of the body internally or externally is called  coordination. Nervous coordination is brought about by the nervous system which is made up of the brain, spinal cord, nerves and the sense organs. Chemical coordination is brought about through chemical messengers called hormones. The nervous system is made up of special cells called nerve cells or neurons. The end of the axon terminates in a number of branches called terminal branches. The terminal branches of the axon of one neuron lie very close to the dendrites of another neuron. This point of contact is called a synapse. A nerve is formed of a bundle of axons (nerve fibres) enclosed in a tubular medullary sheath.  There are three kind of nerves as describe sensory nerve motor nerve mixed nerve. The nervous sytem of human beings consists of the following three systems: Th...

ICSE Living Science Biology for Class 7 Solutions Chapter 7 Excretion in animals and plants State if the following statements are true or false. Correct the statemenet if it is false. Question 1. The organs that help our body to get rid of waste are called respiratory organs. Answer: False. The organs that help our body to get rid of waste are called excretory organs. Question 2. Each kidney contains millions of microscopic filtering units called ureters. Answer: False. Each kidney contains millions of microscopic filtering units called nephrons. Question 3. The Bowman’s capsule and glomerulus together form the Malpighian body. Answer: True Question 4. Liver produces bile pigments from the haemoglobin of broken RBCs. Answer: True A. Tick the most appropriate answer. Question 1. The process of removing waste from the body is callec – a. respiration b. excretion c. inspiration d. expiration Answer: b. excretion Question 2. The opening of the urinary bladder is called – a. nephron b. urin...

Selina Concise ICSE Solutions for Class 7 Biology Chapter 4 Photosynthesis and Respiration Synopsis — The process of preparing or synthesising food using water from the soil and carbon dioxide from the air, together chlorophyll and sunlight is called  photosynthesis . Photosynthesis occurs in the mesophyll cells of the leaf. These cells contain numerous plastids called chloroplasts. With in the plastids is present the green pigment called chlorophyll. On the lower surface of the leaf are numerous pores called  stomata , which open into small air cavities inside the leaf. Stomata are tiny openings found mainly on the lower surface of leaves. These openings are surrounded by a pair of bean¬shaped cells called guard cells. All plants have a transport system called vascular system. It is composed of two types of tissues called xylem and phloem. There are two end-products of photosynthesis : Glucose (C 6 H 12 O 6 ) Oxygen The energy released during respiration is stored as chemical...

Selina Concise ICSE Solutions for Class 7 Biology Chapter 3 Classification of Animals Synopsis  The animals can move from one place to another in search of food and shelter and this is called locomotion.  The vertebrates can be classified into five classes:  Pisces (Fishes)  Amphibia (Frogs)  Reptilia (Lizards and Snakes)  Aves (Birds) (Mammalia (Milk – nourishing animals) Pisces / Fishes  have streamlined body shape  Locomotion with the help of fins  Body covered with scales.  Breathe through gills. Example:  Dogfish, Catla   Amphibia / Frogs  can live in water as well as on land. always lay their eggs in water. body covered by a slimy and slippery skin breathe through lungs and skin. Example : Frog and toads.  Reptilia  Mostly live on land  Skin is dry and scaly  Breathe through lungs Females lay eggs on land Example:  Lizards, snakes, crocodiles A ves / Birds Body covered with feathers. Have wi...

Selina Concise ICSE Solutions for Class 7 Biology Chapter 2  Classification of Plants Synopsis: Classification means grouping things together on the basis of certain common features. The classification helps us to identify the living organisms and to study them more easily and systematically. The plants can be classified as follows on the basis of their size and shape as: Herbs Shrubs Trees. The plants which have soft, green and perishable stems are called  herbs. Example:  maize, rice, mint etc.  The plants with woody stems, with branches of almost equal size arising from the stem immediately above the soil are called  shrubs . Example:  Lemon, jasmine etc. The plants which are tall and have hard, woody stems and bear woody branches, twigs and leaves at some distance above the ground are called trees. Example : Coconut and palm. Non – flowering plants are called  Cryptogams Flowering plants are called  Phanerogams. The non-flowering plants can be...